Magmatism at Passive Margins: Effects of Depth?Dependent Wide Rifting and Lithospheric Counterflow

نویسندگان

چکیده

Rifted passive margins exhibit a large variety in the timing, distribution, and amount of magmatism. The factors controlling magmatism during rifted margin formation, remain, however, incompletely understood, partly owing to complex rifting styles. In this study, we use 2-Dimensional numerical models investigate effects depth-dependent wide lithospheric counterflow on formation. Results show that strong crust promotes narrow with sharp transition normal thickness oceanic whereas weak rifting, preferential removal mantle lithosphere, leading formation over-thickened (>18 km) igneous distal margin. Counterflow depleted mantle, contrast, may delay syn-rift magmatism, result exhumed a-magmatic continental at margins. combination results magma-poor margins, some cases excess magmatic activity breakup. Our provide an explanation for contrasting productivity such as observed Lofoten-Vesterålen, Newfoundland, Kwanza Basin, Orange Basin

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ژورنال

عنوان ژورنال: Journal Of Geophysical Research: Solid Earth

سال: 2022

ISSN: ['2169-9356', '2169-9313']

DOI: https://doi.org/10.1029/2021jb023046